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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of fungal melanins and soil humic acids by chemical analysis and infrared spectroscopy (1990)
    Springer
    Biology and fertility of soils 10 (1990), S. 72-76 
    Details
    ISSN: 1432-0789
    Keywords: Brazilian soils ; Fungal melanins ; Soil humic acid ; Infrared analysis ; Latosols
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Humic acids from two Brazilian topsoils under savanna grassland and five soil fungal melanins were characterized by elemental, functional group and infrared analysis. C, N, total acidity, COOH, and phenolic OH contents were within the ranges reported for several other fungal melanins and soil humic acids. Compared with the soil humic acids, the infrared spectra of the fungal melanins showed greater detail, indicative of higher aliphaticity. They were similar to the type III infrared spectra of humic acids, which are characteristically high in proteinaceous material and polysaccharides. The infrared spectra of the humic acids from the two Brazilian soils studied were classified as type I, which includes most soil humic acids. Notwithstanding the greater detail, in some areas the fungal melanin spectra were similar to those reported for other fungal melanins and humic acids of different origins. The probable contribution of the melanic fungi to the formation of soil humic polymers is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336128
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Melanogenic actinomycetes (Streptomyces spp.) from Brazilian soils (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 220-224 
    Details
    ISSN: 1432-0789
    Keywords: Actinomycetes ; Melanins ; Growth media ; Tropical soil ; Streptomyces spp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Melanogenic actinomycetes were isolated from cerrado soils. Starch agar with a neutral pH was the best medium for selecting pigment-producing colonies. A pigmentation screening test selected 52% of these as possible melanin producers. Tests on liquid (organic and inorganic) and solid (peptone and tyrosine) media, and enzymatic tests, confirmed about 90% as melanin producers, 68% as dihydroxyphenylalanine (DOPA)-melanin and 32% as possible other kinds of melanin producers. Melanin production occurred mostly with an organic N, or an inorganic N with an additional organic N source. An exception was observed with three strains, which were able to produce melanins with an entirely inorganic N source in the medium. Instability of melanin production was a common feature in many strains. Further characterization of melanins produced by actinomycetes compared with soil humic acids may clarify the possible role of melanogenic actinomycetes in soil organic matter formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361615
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    Paper (German National Licenses)
    Fulltext
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